The Lord will not destroy the wicked without giving them adequate warning. The Lord was merciful enough to give the Nephites their last chance for repentance. The promise of the Lord was that there was still hope if they would repent, but as Mormon said, it was in vain. Much like Mormon gave the Nephites their final warning, the Lord has instructed us to issue the same warning, the voice of warning shall be unto all people, by the mouths of my disciples, whom I have chosen in these last days (DC 1:4)…For behold, this is the last time that I shall nourish my vineyard (Jacob 5:71). Certainly, the destruction of the Nephite nation is a type for the destruction which will come upon the wicked at the Second Coming.
Marion G. Romney
“We who today bear the priesthood of God are the legal heirs to this great commission. Ours is the responsibility of officially declaring repentance unto all the inhabitants of the earth. None are exempt. We must discharge this responsibility, regardless of the manner in which our message is received.” (Conference Report, Apr. 1950, p. 87)
Joseph Fielding Smith
“That is our duty. When we see evil lurking, when we see dangers confronting the people, and especially the Latter-day Saints, it is our duty to raise the warning voice, and not only in behalf of the Latter-day Saints, but to warn all people, for our mission is one that is world-wide, and we should warn all men and give them the opportunity of repentance, of serving the Lord and keeping his commandments if they will. If they will not, then we have saved our souls. We are clear from the blood of this generation. That is our duty.” (Conference Report, Oct. 1933, p. 61)